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How to make a Textbox numeric using JavaScript

posted June 1, 2008 - 6:39am
How to make a Textbox numeric using JavaScript

As we all know that using JavaScript, we can capture the keycode of the key. So I have used this logic to validate the user input. When user will enter any key in textbox at that time its keycode will checked in javascript function below.

*************************************************************

JavaScript Function < b>

function fInputNumericValuesOnly()
{
if(!(event.keyCode==45||event.keyCode==46||event.keyCode==48||event.keyCode==49||event.keyCode==50||event.keyCode==51||event.keyCode==52||event.keyCode==53||event.keyCode==54||event.keyCode==55||event.keyCode==56||event.keyCode==57))
{
event.returnValue = false;
}
}

Explanation

I have validated the keycode from 0 to 9. If the keycode is not from 0 to 9 then it will return the false value. So user can not enter the character except 0 to 9.
You have to just call this function in onKeyDown part of the textbox property.

Author: bkchakraborty91
-A +A

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Comments

I Beg to Differ

taranitely - Wed, 2008-4-6 2:58 am
Do you realise that there is no difference between the results of either of those pieces of code? They both return true and false for the same ranges.

Follow my posts: taranitely

Yes you can do so but actual

bkchakraborty91 - Wed, 2008-4-6 2:46 am
Yes you can do so but actual will be if (event.keyCode >= 45 && event.keyCode <= 57)

SC

A Better Way

taranitely - Sun, 2008-1-6 8:16 am
Instead of typing all that out, why didn't you just say... if (event.keyCode < 45 || event.keyCode > 57) ...just a thought.

Follow my posts: taranitely

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